Process for making or concentrating hydrogen peroxide



scription of the invention,

neutral reaction.

Patented Oct. 14, 1924.

UNITED s'rA'rss PATENT, OFFICE.

G'U 'STA/V BAUE, OF CABINTHIA, AUSTRIA, ASSIGNOR TO THE FIRM 0F CHEMISCHE I FABRD! WEISSENSTEIN G. M. B. 3., 0T

CARINTHIA. AUSTRIA.

PROCESS FOR MAKING OB CONCENTRATING HYDROGEN PEROXIDE.

lb Drawing.

To all whom it may concern:

Be it known that I, GUSTAV Baum, a citizen of the Republic of Austria, and residing at Weissenstein ob der Drau, Carinthia, in

l the Republic of Austria, have invented certain new and useful Improvements in Processes for Making or Concentrating Hydrogen Peroxide' and I do hereby declare the following to he a full, clear, and exact desuch as will enable others skilled in the ap ertains to make and use the same.

11 important consideration in the art of distilling or concentrating hydrogen eroxide is the material which is to be used or the apparatus required for the gm ose. Scientific and technical knowle go as hitherto excluded metals for the purpose, so that recourse has been had to materials such as earthenware, glass, quartz and the like, which are but poor conductors of heat and are, moreover, open to the usual wellknown ob'ections. y

Y e' present invention is based on the observation that substances which contain hyn peroxide, either in the free form or e latent form, are not affected catalytically by contact with tantalum, even at a high temperature,

According to the "invention, therefore, vesart to which it v densers, or the water may concentrated liquid may when they are of acid or Application med August 22, 1922; Serial 110. 588,866.

sels which are to be used for distilling, condensing or concentrating hydrogen peroxide, or materials containing it, as aforesaid, are made of tantalum which conducts heat well and is both mechanically and chemically a metal of high resistance.

For example, persulphuric acid or acid ammonium persulphate solution may be evaporated in pipes or retorts constructed of tantalum,'and the hydrogen peroxide obtained may be condensed in tantalum conbe expelled almost wlthout loss from dilute hydrogen peroxide solutions, fo'r'instance of 8 per cent strength, in a tantalum vessel, so that the contain per cent or over of hydrogen peroxide. What I claim is-- The process of making or concentrating hydrogen peroxide, which consists in evaporating a per-sulphuric compound and in condensin the vapors of hydrogen peroxide formed t erefrom in vessels of tantalum, said metalbeing inert and non-catalytic with respect to said per-compounds.

'In testimony that I claim the foregoing as m invention I have si ed my name,

7 GU TAv BAUM. Witn; g 1 v .INGOHEM J. Rrmmm,

Inca. En. Gross. 

